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Facial expression datasets remain limited in scale due to the subjectivity of annotations and the labor-intensive nature of data collection. This limitation poses a significant challenge for developing modern deep learning-based facial…

Computer Vision and Pattern Recognition · Computer Science 2025-08-13 Xilin He , Cheng Luo , Xiaole Xian , Bing Li , Muhammad Haris Khan , Zongyuan Ge , Weicheng Xie , Siyang Song , Linlin Shen , Bernard Ghanem , Xiangyu Yue

Unsupervised domain adaptation addresses the problem of classifying data in an unlabeled target domain, given labeled source domain data that share a common label space but follow a different distribution. Most of the recent methods take…

Computer Vision and Pattern Recognition · Computer Science 2023-02-24 Hui Tang , Yaowei Wang , Kui Jia

Occluded person re-identification is a challenging task as human body parts could be occluded by some obstacles (e.g. trees, cars, and pedestrians) in certain scenes. Some existing pose-guided methods solve this problem by aligning body…

Computer Vision and Pattern Recognition · Computer Science 2021-12-14 Tao Wang , Hong Liu , Pinhao Song , Tianyu Guo , Wei Shi

Source-free domain adaptation (SFDA) aims to adapt a classifier to an unlabelled target data set by only using a pre-trained source model. However, the absence of the source data and the domain shift makes the predictions on the target data…

Computer Vision and Pattern Recognition · Computer Science 2022-08-17 Subhankar Roy , Martin Trapp , Andrea Pilzer , Juho Kannala , Nicu Sebe , Elisa Ricci , Arno Solin

Domain Adaptation (DA) is a highly relevant research topic when it comes to image classification with deep neural networks. Combining multiple source domains in a sophisticated way to optimize a classification model can improve the…

Computer Vision and Pattern Recognition · Computer Science 2020-10-19 Sebastian Schrom , Stephan Hasler , Jürgen Adamy

The primary objective of domain adaptation methods is to transfer knowledge from a source domain to a target domain that has similar but different data distributions. Thus, in order to correctly classify the unlabeled target domain samples,…

Machine Learning · Computer Science 2019-08-12 Rohith AP , Ambedkar Dukkipati , Gaurav Pandey

Deep learning-based methods have been the key driving force behind much of the recent success of facial expression recognition (FER) systems. However, the need for large amounts of labelled data remains a challenge. Semi-supervised learning…

Computer Vision and Pattern Recognition · Computer Science 2024-11-25 Shuvendu Roy , Ali Etemad

With the transition of facial expression recognition (FER) from laboratory-controlled to challenging in-the-wild conditions and the recent success of deep learning techniques in various fields, deep neural networks have increasingly been…

Computer Vision and Pattern Recognition · Computer Science 2020-04-20 Shan Li , Weihong Deng

People can innately recognize human facial expressions in unnatural forms, such as when depicted on the unusual faces drawn in cartoons or when applied to an animal's features. However, current machine learning algorithms struggle with…

Computer Vision and Pattern Recognition · Computer Science 2023-04-06 Michael Stettler , Alexander Lappe , Nick Taubert , Martin Giese

This paper targets to explore the inter-subject variations eliminated facial expression representation in the compressed video domain. Most of the previous methods process the RGB images of a sequence, while the off-the-shelf and valuable…

Computer Vision and Pattern Recognition · Computer Science 2021-01-11 Xiaofeng Liu , Linghao Jin , Xu Han , Jun Lu , Jane You , Lingsheng Kong

Medical image segmentation methods normally perform poorly when there is a domain shift between training and testing data. Unsupervised Domain Adaptation (UDA) addresses the domain shift problem by training the model using both labeled data…

Computer Vision and Pattern Recognition · Computer Science 2023-11-03 Yan Wang , Jian Cheng , Yixin Chen , Shuai Shao , Lanyun Zhu , Zhenzhou Wu , Tao Liu , Haogang Zhu

Deep learning models often struggle under natural distribution shifts, a common challenge in real-world deployments. Test-Time Adaptation (TTA) addresses this by adapting models during inference without labeled source data. We present the…

Computer Vision and Pattern Recognition · Computer Science 2026-03-23 John Turnbull , Shivam Grover , Amin Jalali , Ali Etemad

To address the problem of data inconsistencies among different facial expression recognition (FER) datasets, many cross-domain FER methods (CD-FERs) have been extensively devised in recent years. Although each declares to achieve superior…

Computer Vision and Pattern Recognition · Computer Science 2021-12-01 Tianshui Chen , Tao Pu , Hefeng Wu , Yuan Xie , Lingbo Liu , Liang Lin

The recent research of facial expression recognition has made a lot of progress due to the development of deep learning technologies, but some typical challenging problems such as the variety of rich facial expressions and poses are still…

Computer Vision and Pattern Recognition · Computer Science 2019-07-26 Wenxuan Wang , Qiang Sun , Tao Chen , Chenjie Cao , Ziqi Zheng , Guoqiang Xu , Han Qiu , Yanwei Fu

Semi-supervised domain adaptation methods leverage information from a source labelled domain with the goal of generalizing over a scarcely labelled target domain. While this setting already poses challenges due to potential distribution…

Artificial Intelligence · Computer Science 2024-06-21 Cassio F. Dantas , Raffaele Gaetano , Dino Ienco

Bringing empathy to a computerized system could significantly improve the quality of human-computer communications, as soon as machines would be able to understand customer intentions and better serve their needs. According to different…

Computer Vision and Pattern Recognition · Computer Science 2021-06-04 Kamil Akhmetov

The real-world facial expression recognition (FER) datasets suffer from noisy annotations due to crowd-sourcing, ambiguity in expressions, the subjectivity of annotators and inter-class similarity. However, the recent deep networks have…

Computer Vision and Pattern Recognition · Computer Science 2022-08-23 Darshan Gera , Naveen Siva Kumar Badveeti , Bobbili Veerendra Raj Kumar , S Balasubramanian

Compared with the image-based static facial expression recognition (SFER) task, the dynamic facial expression recognition (DFER) task based on video sequences is closer to the natural expression recognition scene. However, DFER is often…

Computer Vision and Pattern Recognition · Computer Science 2022-08-23 Hanting Li , Hongjing Niu , Zhaoqing Zhu , Feng Zhao

Facial expression data is characterized by a significant imbalance, with most collected data showing happy or neutral expressions and fewer instances of fear or disgust. This imbalance poses challenges to facial expression recognition (FER)…

Computer Vision and Pattern Recognition · Computer Science 2023-10-31 Yuhang Zhang , Yaqi Li , Lixiong Qin , Xuannan Liu , Weihong Deng

Source-Free Domain Adaptation (SFDA) aims to solve the domain adaptation problem by transferring the knowledge learned from a pre-trained source model to an unseen target domain. Most existing methods assign pseudo-labels to the target data…

Computer Vision and Pattern Recognition · Computer Science 2022-10-17 Xinyu Guan , Han Sun , Ningzhong Liu , Huiyu Zhou